See my comparisons with official US-trackmaster track. The length and spacing is a bit off which may make it hard to do complete loops unless you use an even amount of pieces somewhere else or in the return. The 3D printed is obviously thick and much stronger, so I would use this for raised bridges, inclines, etc. This design does not have a lock on the open part, but this does not seem to matter. Printed with PLA so very rigid - only a little bit more pressure to snap in or remove. P1S, bambu slicer.